Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate Δ H ° for the conversion of methane to ethylene: C H 4 ( g ) → C 2 H 4 ( g ) + 2 H 2 ( g ) You can use the following information: 2 C 2 H 6 ( g ) + 7 O 2 ( g ) → 4 C O 2 ( g ) + 6 H 2 O ( l ) Δ H ° = − 3120.8 kJ C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( l ) Δ H ° = − 890.3 kJ C 2 H 4 ( g ) + H 2 ( g ) → C 2 H 6 ( g ) Δ H ° = − 136.3 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol
Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate Δ H ° for the conversion of methane to ethylene: C H 4 ( g ) → C 2 H 4 ( g ) + 2 H 2 ( g ) You can use the following information: 2 C 2 H 6 ( g ) + 7 O 2 ( g ) → 4 C O 2 ( g ) + 6 H 2 O ( l ) Δ H ° = − 3120.8 kJ C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( l ) Δ H ° = − 890.3 kJ C 2 H 4 ( g ) + H 2 ( g ) → C 2 H 6 ( g ) Δ H ° = − 136.3 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol
Solution Summary: The author explains that the value of change in enthalpy for the conversion of methane to ethylene needs to be determined.
Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate
Δ
H
°
for the conversion of methane to ethylene:
C
H
4
(
g
)
→
C
2
H
4
(
g
)
+
2
H
2
(
g
)
You can use the following information:
2
C
2
H
6
(
g
)
+
7
O
2
(
g
)
→
4
C
O
2
(
g
)
+
6
H
2
O
(
l
)
Δ
H
°
=
−
3120.8
kJ
C
H
4
(
g
)
+
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
l
)
Δ
H
°
=
−
890.3
kJ
C
2
H
4
(
g
)
+
H
2
(
g
)
→
C
2
H
6
(
g
)
Δ
H
°
=
−
136.3
kJ
H
2
O
(
l
)
Δ
H
°
f
=
−
285.8
kJ/mol
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help
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